To order the right Canariam boot you first need to measure your foot. Using this link measure your foot: (how to measure your foot). Now using that measurement find the American or European size below that comes closest to the measurement you got. If your foot measured 10 1/4 inch or 260 millimeters you would order a size 8 or 40 boot. The Camnariam boots come with an insole but I havn't used it through any of the testing or sizing so if you decide to use the insole that comes with the boot you may want to get the boot 1 size larger than the chart shows below to make room for the insole. The sizes 30, 31, 45 and 46 are special order boots so expect a week extra to special order those boots.